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Securing Linux - first steps...

Hello there, i installed slackware 10 in a machine which it is online continuously..
I want to secure it first from the inside (eg:for local users) because i dont run any services like apache or ircd 9yet)
I am wondering how (if i can) "Jail" a user into his directory...
Let me explain. if i am user chris, in this system i want this user to see only his directory (e.g. /home/chris) and nothing else (like /etc or other user's accounts)
Is there any script/patch/program to help me ?
Thanks